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There are two formulas to use to get the equivalent overall permeability of a layered system depending on which way your layers are oriented with respect to your flow direciton. However, the permeability of the material types you have listed have a wide range, and many references will not report the exam same range of permeability for the material type.

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Seems like a question where they would give you the expected permeability for the soil class...anything you would get from a reference for those classes would have a range of at least a few orders of magnitude.